Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b7af003fb4d958…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 19:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc88fcdc9040a5f15d3eac6a55e75d7a SHA-1: 299c7d6107943ab8076e9ab841d726339094433c SHA-256: 82b7af003fb4d95839f69af1c623f6a53195863a50e6ef32a74953956b69ec0e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of link farms designed to obscure the true destination. One high-severity heuristic specifically flagged a PDF link pointing to an algorithmically-generated URL, suggesting a malicious intent to redirect users to a harmful resource. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://chiangmai-esc.net/user_img/files/36842057032.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/64030862796.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/bosixukupafomosujan.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/nepobobipamo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321af3322bb---77758721677.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/mosirixovogowuja.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kovebidedom.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/73214925802.pdfIn PDF document text
    • https://coluer.ir/documents/file/xuvodififadix.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc7a1b0ba---mefobuxakodetesovezufofo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/92520240431.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/nufigik.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nilusoramazufafun.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414622f0653---56301174506.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96751b57a---kibedopopavovepimezoxu.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/60532204312.pdfIn PDF document text
    • http://ecole.ru/text/images/file/36780949399.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rh561dhmglk71fphnan5jl8u7g/25827136116.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/funuwigo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/vagerilobekujudidupunuju.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/55133248631.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vijijas.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/88859683451.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zewaxitavusixizamer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cool+games+to+play+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 10880 bytes
SHA-256: 95d247ecfa3478a699d882124f463c78d9a480cb0f284329325d5256764d3ed0
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 17876 bytes
SHA-256: 0e69d2ea45bafdcc3890da98a8bec9c7ada2660a963d21dbeabed8483cc794fc
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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